JP2000306351A - Liner for magnetic disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the dust-proof properties while preventing fiber tips from dropping from a linear itself, and improve the reliability by obtaining a good cleaning action. SOLUTION: Liners 5 and 6 fixed opposite to a disc-shaped magnetic disk medium 4 are set to the inner face of a case C obtained by joining an upper shell 1 and a lower shell 2 in which the magnetic disk medium can be accommodated rotatably. The liners 5 and 6 are obtained by raising a surface of a woven cloth using long fibers of at least one of polyester, acryl, nylon and cotton.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liner for a magnetic disk cartridge which is fixed to an inner surface of a case for housing a magnetic disk medium.

[0002]

2. Description of the Related Art In a magnetic disk cartridge in which a disk-shaped magnetic disk medium is rotatably accommodated in a case in which upper and lower shells are joined, a liner made of nonwoven fabric or the like is generally fixed to the inner surfaces of the upper and lower shells. ing.

The liner has a function of wiping and removing dust adhered to the surface of a magnetic disk medium. Conventionally used liners are mainly formed of rayon fibers having high dust collecting properties.

[0004]

However, in the liner using rayon fiber as described above, dust is generated from the liner itself during use of the magnetic disk cartridge, and the dust is generated by the magnetic head during recording and reproduction. The recording surface may be damaged or a problem such as dropout may occur due to the bite between the disk media.

[0005] The dust generated from the rayon fiber liner includes insufficiently fixed fiber waste retained in the liner during the manufacturing process, and this is separated from the liner when the upper and lower shells are joined or when used. It adheres to the magnetic disk medium and causes a dropout or the like as described above. In particular, rayon fibers are brittle and difficult to be made into long fibers, and include short fibers that are insufficiently bonded when used as a nonwoven liner, and are likely to fall off as the above-mentioned fiber waste.

In recent years, high-speed rotation has been attempted in response to an increase in the recording capacity of a magnetic disk medium, and the liner is magnetically lifted by a lifter in order to secure the stability of the driving torque and suppress the increase in the torque capacity of the motor. Instead of forcing the disk media into contact, there is a tendency to reduce contact with the liner. Accordingly, in the case of the nonwoven liner having a flat surface made of the rayon fiber, the dust removing effect on the surface of the magnetic disk medium is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liner for a magnetic disk cartridge in which the removal of fiber waste is prevented and the dust removing property is enhanced.

[0008]

According to the present invention, there is provided a magnetic disk cartridge liner in which a disk-shaped magnetic disk medium is rotatably accommodated in a case formed by joining an upper shell and a lower shell. A liner fixed to the inner surfaces of an upper shell and a lower shell of the cartridge facing the magnetic disk medium of the case, wherein the liner uses a long fiber made of at least one of polyester, acrylic, nylon, and cotton. The surface of the woven fabric is brushed.

The raising of the liner is carried out entirely or partially on the surface facing the magnetic disk medium.

[0010]

According to the present invention as described above, the surface of a woven fabric using long fibers made of polyester, acrylic, nylon or cotton is brushed on the surface of the liner, so that the liner easily falls into the liner. Because it does not contain short fibers, it can prevent the generation of dust due to the removal of fiber waste from the liner itself, can basically suppress the occurrence of dropouts, and the surface raised with the rotation of the magnetic disk media The magnetic disk medium can be removed from the surface of the magnetic disk medium by contacting dust adhering to the surface of the medium, and the surface cleaning effect of the magnetic disk medium can be obtained without using a lifter. Reliability can be improved without causing dropout or the like due to dust adhering to the head gap.

Further, the raised surface of the liner has a small contact resistance, reduces an increase in torque loss with respect to rotation of the magnetic disk medium, and can stably perform high-speed rotation driving even on a magnetic disk medium with a high recording density. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is an exploded perspective view of the upper and lower shells of a magnetic disk cartridge according to one embodiment.

In the magnetic disk cartridge, a flat case C (hard case) is formed by joining an upper shell 1 and a lower shell 2 formed of a synthetic resin such as acrylonitrile-butadiene-styrene copolymer. A disk-shaped magnetic disk medium 4 whose central portion is attached to and held by the center core member 3 is rotatably accommodated in C. An upper liner 5 and a lower liner 6 are provided above and below the magnetic disk medium 4.

The magnetic disk medium 4 has a disk-shaped base made of a flexible polyester sheet or the like, and magnetic layers are formed on both sides of the disk-shaped base. An area 4a is set, and the inner and outer edges of this recording area are non-recording areas 4b.

The upper shell 1 and the lower shell 2 have a substantially rectangular flat shape, and outer peripheral ribs 1a and 2a forming side walls are provided on the outer periphery.
b, 2b, and a rectangular magnetic head insertion opening 10,
An opening 11 is formed in the center portion of the lower shell 2, and a circular spindle hole 2 c is formed in a size that the center core member 3 faces. Although not shown, a shutter member slidable in the left-right direction in the figure is assembled to open and close the magnetic head insertion openings 10 and 11 of the case C.

Further, a sheet-shaped octagonal (or round) upper liner 5 and a lower liner 6 are fixed to the inner surfaces of the upper shell 1 and the lower shell 2 by ultrasonic welding, bonding or the like. The inner ribs 1b and 2b are formed outside the liners 5 and 6 along the shape thereof. The fixing of the liners 5 and 6 is performed entirely or partially, and in particular, the liners 5 and 6 may be partially fixed so that a part is a free end.

An annular projection 12 is provided at the center of the inner surface of the upper shell 1 at a position inward of the center core member 3, and the annular projection 12 is fitted on the inner peripheral side of the center core member 3 so as to fit the magnetic disk. The movement of the medium 4 in the radial direction is restricted.

The upper liner 5 and the lower liner 6 have the same shape, and the portion overlapping the magnetic head insertion openings 10 and 11 is cut off, and the central portion is slightly larger than the outer diameter of the annular projection 12 or the spindle hole 2c. A circular hole is opened.

The liners 5 and 6 form a woven fabric using a single long fiber having a length of about several meters and made of polyester (for example, polyethylene terephthalate or the like), acrylic, nylon, or cotton; The surface of the woven fabric is entirely or partially raised. The raising process is, for example, a process in which the ends of long fibers are raised on the surface by brushing the surface with a brush-like material to raise the surface. 2 is provided so that the leading end of the magnetic disk medium 4 is lightly attached to the surface of the rotating magnetic disk medium 4 while being fixed to the inner surface of the magnetic disk medium 2.

The cut ends of the liners 5 and 6 may be subjected to a fiber fixing process by applying an adhesive, heat-sealing, or the like.

According to the magnetic disk cartridge provided with the liners 5 and 6 as described above, when the magnetic disk medium 4 is inserted into the drive device and driven to rotate, the raised ends of the upper and lower liners 5 and 6 become magnetic. Disk media 4
Lightly touch the surface of the The dust adhering to the surface of the magnetic disk medium 4 has a slight adhesive property, and the raised ends of the upper and lower liners 5, 6 come into contact with each other and give the dust a moving energy exceeding the static adhesive force. As a result, the dust starts to move, moves in the outer peripheral direction due to the centrifugal force of the dust accompanying the rotation of the magnetic disk medium 4, and generates an air flow flowing outward on the surface of the magnetic disk medium 4 due to the rotation of the magnetic disk medium 4. This air flow also moves in the outer peripheral direction, and floats and is absorbed and absorbed by the upper and lower liners 5, 6 or is removed outside the recording area 4a to perform cleaning, and dust is removed from the magnetic head. Prevents intrusion into the contact area and does not cause dropout.

The liners 5 and 6 are made of a woven fabric using long fibers made of polyester, acrylic, nylon or cotton, so that the liners 5 and 6 do not contain short fibers that are easily detachable, and generate dust due to dropped fiber waste. Has been prevented.

Further, the contact between the raised tip for the cleaning action and the surface of the magnetic disk medium 4 is a partial contact with the whole of the magnetic disk medium 4 and the raised tip. The drive loss of the rotational torque of the magnetic disk medium 4 is small, and even the magnetic disk medium 4 with a high recording density can be stably and reliably rotated at a high speed by a small drive motor.

As the method of raising the brush, a known method such as raising the end of the long fiber by suction with a vacuum, in addition to the raising of the brush with the above brush, can be adopted.
Raising treatment is selected so that the raised portions do not fall off and become dust even if the fibers are cut somewhat. Further, the design of the raised area can be changed as appropriate, as long as the raised area is set so that the range of contact with the rotation of the magnetic disk medium 4 becomes the entire recording area 4a.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an upper and lower shell of a magnetic disk cartridge having a liner and a magnetic disk medium according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper shell 2 Lower shell 2c Spindle hole C case 3 Center core member 4 Magnetic disk medium 4a Recording area 5,6 Liner 10,11 Magnetic head insertion opening 12 Annular protrusion

Claims (1)

[Claims] An inner surface of an upper shell and a lower shell of a magnetic disk cartridge rotatably housing a disk-shaped magnetic disk medium in a case formed by joining an upper shell and a lower shell. A liner for fixing the surface of a woven fabric using a long fiber made of at least one of polyester, acrylic, nylon, and cotton. liner.